K1 Aero rear belt tension

[felix777]

Hi, I recently built my k1 aero, and have run it at two meetings so far. After almost every run I found that the rear belt keeps getting looser, even though the tensioner appears to be in the same place and tightened fully. I have had no issues with the front belt though. Could anyone possibly help me with this?
Cheers

[h0m3sy]

Could you post up a picture so we can get a closer look at your belt tensioner?

[felix777]

Here you go

[andy-aj]

Are you 100% the tensioner is not moving? Set the tensioner, then put a dot of Tipex or something similar, on the edge of the washer under the tensioner nut. Do a run, then see if the tensioner has moved.

[felix777]

Ok, will try that and let you know.

[h0m3sy]

Originally Posted by andy-aj

Are you 100% the tensioner is not moving? Set the tensioner, then put a dot of Tipex or something similar, on the edge of the washer under the tensioner nut. Do a run, then see if the tensioner has moved.

+1 on this, I've had the tensioner come loose and move before. Make sure you do it up as tight as you can. The belt will naturally become looser as it stretches as well.

[felix777]

Yes I'm going to see if the tensioner moves Thanks for all your help guys

[bigbaza555]

Hi I have had issues with it coming lose and found the standard washer under the nut gets deformed and that's the reason it comes lose as the pressure on the nut is not even so swap it out for a beefier one and a flanged M3 nut since I did that I have had no issues.

[felix777]

Ran it in a test today, the belt tension has not changed at all! Tensioner has not moved either, so I reckon it was just due to the fact that the belt took a while to stretch properly. If there are any more problems I will post them up. Once again thanks for the help guys